<title>Nút Messenger</title> <style> .messenger-button { position: fixed; bottom: 20px; right: 20px; background-color: #0084FF; color: white; padding: 10px 15px; border: none; border-radius: 5px; font-size: 16px; box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); cursor: pointer; z-index: 1000; }

    .messenger-button:hover {
        background-color: #005BBB; 
    }
</style>

💬 Nhắn tin qua Messenger